/* createrepo_c - Library of routines for manipulation with repodata
 * Copyright (C) 2012  Tomas Mlcoch
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 */

#ifndef __C_CREATEREPOLIB_MISC_H__
#define __C_CREATEREPOLIB_MISC_H__

#ifdef __cplusplus
extern "C" {
#endif

#include <glib.h>
#include <string.h>
#include <curl/curl.h>
#include "compression_wrapper.h"
#include "xml_parser.h"

/** \defgroup   misc    Miscellaneous useful functions and macros.
 *  \addtogroup misc
 *  @{
 */

/** Lenght of static string (including last '\0' byte)
 */
#define CR_STATICSTRLEN(s) (sizeof(s)/sizeof(s[0]))

/* Length of static defined array.
 */
#define CR_ARRAYLEN(x) ((sizeof(x)/sizeof(0[x])) / ((size_t)(!(sizeof(x) % sizeof(0[x])))))

/** Convert flags from RPM header to a string representation.
 * @param flags         flags
 * @return              flags as constant string
 */
const char *cr_flag_to_str(gint64 flags);

/** Epoch-Version-Release representation.
 */
typedef struct {
    char *epoch;        /*!< epoch */
    char *version;      /*!< version */
    char *release;      /*!< release */
} cr_EVR;

typedef struct {
    char *name;
    char *epoch;
    char *version;
    char *release;
} cr_NEVR;

typedef struct {
    char *name;
    char *epoch;
    char *version;
    char *release;
    char *arch;
} cr_NEVRA;

/** Version representation
 * e.g. for openssl-devel-1.0.0i = version: 1, release: 0, patch: 0, suffix: i
 */
struct cr_Version {
    long major;         /*!< version */
    long minor;         /*!< release */
    long patch;         /*!< patch */
    char *suffix;       /*!< rest of version string after conversion */
};


/** Convert epoch-version-release string into cr_EVR structure.
 * If no GStringChunk passed, all non NULL items in returned structure
 * are malloced and in that case, you have to free all non-NULL element
 * yourself.
 * @param string        NULL terminated n-v-r string
 * @param chunk         string chunk for strings (optional - could be NULL)
 * @return              filled NVR
 */
cr_EVR *cr_str_to_evr(const char *string, GStringChunk *chunk);

/** Free cr_EVR
 * Warning: Do not use this function when a string chunk was
 * used in the cr_str_to_evr! In that case use only g_free on
 * the cr_EVR pointer.
 * @param evr           cr_EVR structure
 */
void
cr_evr_free(cr_EVR *evr);

/** Check if the filename match pattern for primary files (files listed
 *  in primary.xml).
 * @param filename      full path to file
 * @return              1 if it is primary file, otherwise 0
 */
static inline int cr_is_primary(const char *filename) {
    if (!strncmp(filename, "/etc/", 5))
        return 1;
    if (!strcmp(filename, "/usr/lib/sendmail"))
        return 1;
    if (strstr(filename, "bin/"))
        return 1;
    return 0;
};

/** Header range
 */
struct cr_HeaderRangeStruct {
    unsigned int start;         /*!< First byte of header */
    unsigned int end;           /*!< Last byte of header */
};

/** Return header byte range.
 * @param filename      filename
 * @param err           GError **
 * @return              header range (start = end = 0 on error)
 */
struct cr_HeaderRangeStruct cr_get_header_byte_range(const char *filename,
                                                     GError **err);

/** Return pointer to the rest of string after last '/'.
 * (e.g. for "/foo/bar" returns "bar")
 * @param filepath      path
 * @return              pointer into the path
 */
char *cr_get_filename(const char *filepath);

/** Return pointer to the rest of string after './' prefix.
 * (e.g. for "././foo/bar" returns "foo/bar")
 * @param filepath      path
 * @return              pointer into the path
 */
char *cr_get_cleaned_href(const char *filepath);

/** Download a file from the URL into the in_dst via curl handle.
 * @param handle        CURL handle
 * @param url           source url
 * @param destination   destination (if destination is dir, filename from the
 *                      url is used)
 * @param err           GError **
 * @return              cr_Error
 */
int cr_download(CURL *handle,
                const char *url,
                const char *destination,
                GError **err);

/** Copy file.
 * @param src           source filename
 * @param dst           destination (if dst is dir, filename of src is used)
 * @param err           GError **
 * @return              TRUE on success, FALSE if an error occured
 */
gboolean cr_copy_file(const char *src,
                      const char *dst,
                      GError **err);

/** Compress file.
 * @param SRC           source filename
 * @param DST           destination (If dst is dir, filename of src +
 *                      compression suffix is used.
 *                      If dst is NULL, src + compression suffix is used)
 * @param COMTYPE       type of compression
 * @param ZCK_DICT_DIR  Location of zchunk zdicts (if zchunk is enabled)
 * @param ZCK_AUTO_CHUNK Whether zchunk file should be auto-chunked
 * @param ERR           GError **
 * @return              cr_Error return code
 */
#define cr_compress_file(SRC, DST, COMTYPE, ZCK_DICT_DIR, ZCK_AUTO_CHUNK, ERR) \
                    cr_compress_file_with_stat(SRC, DST, COMTYPE, NULL, ZCK_DICT_DIR, \
                                               ZCK_AUTO_CHUNK, ERR)

/** Compress file.
 * @param src           source filename
 * @param dst           pointer to destination (If dst is dir, filename of src +
 *                      compression suffix is used.
 *                      If dst is NULL, src + compression suffix is used)
 * @param comtype       type of compression
 * @param stat          pointer to cr_ContentStat or NULL
 * @param zck_dict_dir  Location of zchunk zdicts (if zchunk is enabled)
 * @param zck_auto_chunk Whether zchunk file should be auto-chunked
 * @param err           GError **
 * @return              cr_Error return code
 */
int cr_compress_file_with_stat(const char *src,
                               char **dst,
                               cr_CompressionType comtype,
                               cr_ContentStat *stat,
                               const char *zck_dict_dir,
                               gboolean zck_auto_chunk,
                               GError **err);

/** Decompress file.
 * @param SRC           source filename
 * @param DST           destination (If dst is dir, filename of src without
 *                      compression suffix (if present) is used.
 *                      If dst is NULL, src without compression suffix is used)
 *                      Otherwise ".decompressed" suffix is used
 * @param COMTYPE       type of compression
 * @param ERR           GError **
 * @return              cr_Error return code
 */
#define cr_decompress_file(SRC, DST, COMTYPE, ERR) \
                    cr_decompress_file_with_stat(SRC, DST, COMTYPE, NULL, ERR)

/** Decompress file.
 * @param src           source filename
 * @param dst           destination (If dst is dir, filename of src without
 *                      compression suffix (if present) is used.
 *                      If dst is NULL, src without compression suffix is used)
 *                      Otherwise ".decompressed" suffix is used
 * @param comtype       type of compression
 * @param stat          pointer to cr_ContentStat or NULL
 * @param err           GError **
 * @return              cr_Error return code
 */
int cr_decompress_file_with_stat(const char *src,
                                 const char *dst,
                                 cr_CompressionType comtype,
                                 cr_ContentStat *stat,
                                 GError **err);

/** Better copy file. Source (src) could be remote address (http:// or ftp://).
 * @param src           source filename
 * @param dst           destination (if dst is dir, filename of src is used)
 * @param err           GError **
 * @return              TRUE on success, FALSE if an error occured
 */
gboolean cr_better_copy_file(const char *src,
                             const char *dst,
                             GError **err);

/** Recursively remove directory.
 * @param path          filepath
 * @param err           GError **
 * @return              cr_Error return code
 */
int cr_remove_dir(const char *path, GError **err);

/** Normalize path (Path with exactly one trailing '/').
 *@param path           path
 *@return               mallocated string with normalized path or NULL
 */
char *cr_normalize_dir_path(const char *path);

/** Convert version string into cr_Version struct.
 * @param str           version string
 * @return              cr_Version
 */
struct cr_Version cr_str_to_version(const char *str);

/** Compare two version string.
 * @param str1          first version string
 * @param str2          second version string
 * @return              0 - versions are same, 1 - first string is bigger
 *                      version, 2 - second string is bigger version
 */
int cr_cmp_version_str(const char* str1, const char *str2);

/** Logging function with no output.
 * @param log_domain    logging domain
 * @param log_level     logging level
 * @param message       message
 * @param user_data     user data
 */
void cr_null_log_fn(const gchar *log_domain,
                    GLogLevelFlags log_level,
                    const gchar *message,
                    gpointer user_data);

/** Createrepo_c library standard logging function.
 * @param log_domain    logging domain
 * @param log_level     logging level
 * @param message       message
 * @param user_data     user data
 */
void cr_log_fn(const gchar *log_domain,
               GLogLevelFlags log_level,
               const gchar *message,
               gpointer user_data);

/** Frees all the memory used by a GSList, and calls the specified destroy
 * function on every element's data.
 * This is the same function as g_slist_free_full(). The original function
 * is implemented in glib since 2.28 but we need to support the older glib too.
 * @param list          pointer to GSList
 * @param free_f        the function to be called to free each element's data
 */
void cr_slist_free_full(GSList *list, GDestroyNotify free_f);

/** Convenience method, which frees all the memory used by a GQueue,
 * and calls the specified destroy function on every element's data.
 * This is the same function as g_queue_free_full(). The original function
 * is implemented in glib since 2.32 but we need to support the older glib too.
 * @param queue         a pointer to a GQueue
 * @param the function to be called to free each element's data
 */
void cr_queue_free_full(GQueue *queue, GDestroyNotify free_f);

/** Split filename into the NEVRA.
 * Supported formats:
 * [path/]N-V-R:E.A[.rpm]
 * [path/]E:N-V-R.A[.rpm]
 * [path/]N-E:V-R.A[.rpm]
 * [path/]N-V-R.A[.rpm]:E
 * @param filename      filename
 * @return              cr_NEVRA
 */
cr_NEVRA *cr_split_rpm_filename(const char *filename);

/** Compare evr of two cr_NEVRA. Name and arch are ignored.
 * @param A     pointer to first cr_NEVRA
 * @param B     pointer to second cr_NEVRA
 * @return      0 = same, 1 = first is newer, -1 = second is newer
 */
#define cr_cmp_nevra(A, B) (cr_cmp_evr((A)->epoch, (A)->version, (A)->release,\
                                        (B)->epoch, (B)->version, (B)->release))

/** Compare two version strings splited into evr chunks.
 * @param e1     1. epoch
 * @param v1     1. version
 * @param r1     1. release
 * @param e2     2. epoch
 * @param v2     2. version
 * @param r2     2. release
 * @return       0 = same, 1 = first is newer, -1 = second is newer
 */
int cr_cmp_evr(const char *e1, const char *v1, const char *r1,
               const char *e2, const char *v2, const char *r2);


/** Safe insert into GStringChunk.
 * @param chunk     a GStringChunk
 * @param str       string to add or NULL
 * @return          pointer to the copy of str or NULL if str is NULL
 */
static inline gchar *
cr_safe_string_chunk_insert(GStringChunk *chunk, const char *str)
{
    if (!str) return NULL;
    return g_string_chunk_insert(chunk, str);
}

/** Safe insert into GStringChunk with free the str afterwards.
 * @param chunk     a GStringChunk
 * @param str       string to add or NULL
 * @return          pointer to the copy of str on NULL if str was NULL
 */
static inline gchar *
cr_safe_string_chunk_insert_and_free(GStringChunk *chunk, char *str)
{
    if (!str) return NULL;
    gchar *copy = g_string_chunk_insert(chunk, str);
    g_free(str);
    return copy;
}

/** Safe insert into GStringChunk. If str is NULL or "\0" inserts nothing and
 * returns NULL.
 * @param chunk     a GStringChunk
 * @param str       string to add or NULL
 * @return          pointer to the copy of str or NULL if str is NULL
 */
static inline gchar *
cr_safe_string_chunk_insert_null(GStringChunk *chunk, const char *str)
{
    if (!str || *str == '\0') return NULL;
    return g_string_chunk_insert(chunk, str);
}


/** Safe const insert into GStringChunk.
 * @param chunk     a GStringChunk
 * @param str       string to add or NULL
 * @return          pointer to the copy of str or NULL if str is NULL
 */
static inline gchar *
cr_safe_string_chunk_insert_const(GStringChunk *chunk, const char *str)
{
    if (!str) return NULL;
    return g_string_chunk_insert_const(chunk, str);
}

static inline gboolean
cr_key_file_get_boolean_default(GKeyFile *key_file,
                                const gchar *group_name,
                                const gchar *key,
                                gboolean default_value,
                                GError **error)
{
    GError *tmp_err = NULL;
    gboolean ret = g_key_file_get_boolean(key_file, group_name, key, &tmp_err);
    if (tmp_err) {
        g_propagate_error(error, tmp_err);
        return default_value;
    }
    return ret;
}

/** Warning callback for xml parser warnings.
 * For use in xml parsers like primary, filelists, other or repomd parser.
 * Name of the parser should be passed as a string via
 * warning callback data (warningcb_data) argument of the parser.
 */
int
cr_warning_cb(cr_XmlParserWarningType type,
           char *msg,
           void *cbdata,
           GError **err);

/** Open file and write content.
 * @param err       GError **
 * @param filename  Filename
 * @param format    Format string
 * @param ...       Arguments
 */
gboolean
cr_write_to_file(GError **err, gchar *filename, const char *format, ...);

typedef enum {
    CR_CP_DEFAULT       = (1<<0), /*!<
        No attributes - default */
    CR_CP_RECURSIVE     = (1<<1), /*!<
        Copy directories recursively */
    CR_CP_PRESERVE_ALL  = (1<<2), /*!<
        preserve the all attributes (if possible) */
} cr_CpFlags;

/** Recursive copy of directory (works on files as well)
 * @param src           Source (supports wildcards)
 * @param dst           Destination (supports wildcards)
 * @param flags         Flags
 * @param working_dir   Working directory
 * @param err           GError **
 */
gboolean
cr_cp(const char *src,
      const char *dst,
      cr_CpFlags flags,
      const char *working_directory,
      GError **err);

typedef enum {
    CR_RM_DEFAULT       = (1<<0), /*!<
        No attributes - default */
    CR_RM_RECURSIVE     = (1<<1), /*!<
        Copy directories recursively */
    CR_RM_FORCE         = (1<<2), /*!<
        Use force */
} cr_RmFlags;

/** Wrapper over rm command
 * @param path          Path (supports wildcards)
 * @param flags         Flags
 * @param working_dir   Working directory
 * @param err           GError **
 */
gboolean
cr_rm(const char *path,
      cr_RmFlags flags,
      const char *working_dir,
      GError **err);

/** Append "YYYYmmddHHMMSS.MICROSECONDS.PID" suffix to the str.
 * @param str       String or NULL
 * @param suffix    Another string that will be appended or NULL
 * @param return    Newly allocated string
 */
gchar *
cr_append_pid_and_datetime(const char *str, const char *suffix);

/** Createrepo_c's reimplementation of convinient
 * g_spawn_check_exit_status() function which is available since
 * glib 2.34 (createrepo_c is currently compatible with glib >= 2.28)
 * @param exit_status   An exit code as returned from g_spawn_sync()
 * @param error         GError **
 * @returns             TRUE if child exited successfully,
 *                      FALSE otherwise (and error will be set)
 */
gboolean
cr_spawn_check_exit_status(gint exit_status, GError **error);

/** Parse E:N-V-R or N-V-R:E or N-E:V-R string
 * @param str           NEVR string
 * @returns             Malloced cr_NEVR or NULL on error
 */
cr_NEVR *
cr_str_to_nevr(const char *str);

/** Free cr_NEVR
 * @param nevr      cr_NEVR structure
 */
void
cr_nevr_free(cr_NEVR *nevr);

/** Parse E:N-V-R.A, N-V-R:E.A, N-E:V-R.A or N-V-R.A:E string.
 * @param str           NEVRA string
 * @returns             Malloced cr_NEVRA or NULL on error
 */
cr_NEVRA *
cr_str_to_nevra(const char *str);

/** Free cr_NEVRA
 * @param nevra     cr_NEVRA structure
 */
void
cr_nevra_free(cr_NEVRA *nevra);

/** Are the files identical?
 * Different paths could point to the same file.
 * This functions checks if both paths point to the same file or not.
 * If one of the files doesn't exists, the funcion doesn't fail
 * and just put FALSE into "indentical" value and returns.
 * @param fn1           First path
 * @param fn2           Second path
 * @param identical     Are the files same or not
 * @param err           GError **
 * @return              FALSE if an error was encountered, TRUE otherwise
 */
gboolean
cr_identical_files(const gchar *fn1,
                   const gchar *fn2,
                   gboolean *identical,
                   GError **err);

/** Cut first N components of path.
 * Note: Basename is never cut out.
 */
gchar *
cr_cut_dirs(gchar *path, gint cut_dirs);

/** Return string with createrepo_c lib version and available features
 * @return              String with version and list of features
 */
const gchar *
cr_version_string_with_features(void);

/** Get dict file from dict directory
 * This functions returns a zchunk dictionary file from the zchunk dictionary
 * directory that matches the passed filename.  If no zchunk dictionary file
 * exists or no dictionary directory is set, this function returns NULL
 *
 * The zchunk dictionary file must be the same as the passed filename with a
 * ".zdict" extension
 *
 * @param dir           Zchunk dictionary directory
 * @param file          File being zchunked
 * @return              NULL if no matching file exists, or the full path to the
 *                      file otherwise
 */
gchar *
cr_get_dict_file(const gchar *dir,
                 const gchar *file);

/** @} */

#ifdef __cplusplus
}
#endif

#endif /* __C_CREATEREPOLIB_MISC_H__ */